There is not yet a way to convert BB code to JSON to use in the editor field. This will be a nice feature to have so I will keep my eye on it! You can display plain text using workflow actions though
I just pushed update 1.7.0 that adds the text alignment feature (you can also turn it off):
It is on my list to add multiple language options (aka the ability to replace all the text in the editor with your own). So hopefully I can include that soon!